In test_mysql.py::test_ddl() which uses a validate_identity() call with 2 queries; This indicates that the first query with ALTER COLUMN is what the SQLGlot parser will read, and the second query with ...
mysql_prepare_alter_table() create_table_impl() fill_alter_inplace_info() ha_innobase::check_if_supported_inplace_alter() mysql_inplace_alter_table() // if support ...